Field guide



FIG. 1 is a perspective view of a field guide, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof, the bottom plan view being a mirror image thereof; and,

FIG. 5 is a left-side elevational view thereof, the right-side elevational view being a mirror image thereof. 

I claim the ornamental design for a field guide, as shown and described. 